Depends if the system is wired in that way.
ie: If the system is gravity, definitely not.
If the system is fully pumped, check for a wire in terminal one on the back panel, if there is one, it's possibly wired for independent heating. On the back of the clock there is a 1/4 turn plastic screw that will allow the sliders to work independently.
TURN OFF the electric BEFORE attempting anything, work safely!
Carefree
October 2010
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